Y is directly proportional to the square root of x
if y = 60 when x = 36
find x when y = 80

x = 64

Step-by-step explanation:

Given y is directly proportional to then the equation relating them is

y = k ← k is the constant of proportion

To find k use the condition y = 60 when x = 36, then

60 = k = 6k ( divide both sides by 6 )

10 = k

y = 10 ← equation of proportion

When y = 80 , then

80 = 10 ( divide both sides by 10 )

8 = ( square both sides )

64 = x

step-by-step explanation:

answers available in this download

(pearson%2c%25202012)%2520bbs.pdf& usg=aovvaw1obmtxnfghfgxhx0urh_je

4x and 6y

im not sure though